i have 03 GLE ... recently noticed.. while i gun it.. at like 3500rpm's it seams to sit there for a fraction of a sec at 3500, then rpms drop to about 32-3300 and then start to climb back up.....
i do have a Weapon R intake with Dragon filter.. had it for like 7 month with no problems.
anyone else had somethign like this?

 

its called slipage my freind...
slipage = signs that tranny is slowly going bad.

get your selenoids replaced.. most likely under warranty.. of u can wait till it gets really worse and get a new tranny

happened to me and when a got burned by a v6 mustang i knew it was the tranny.. got it replaced under warranty

 

damn ... my old car had 150k on it ...and i still had original tranny in it.
the max has only 21.5k and its already slipping? wtf? LOL ...
so its deffinetly the tranny?

 

It could definitely also be the MAF...that was my problem and many many many others...unfortunately it won't throw a code for a long time if that is the problem...they're around $90 at least for a 2k i'm not sure about your year...once i replaced mine all power was back after resetting the ECU..good luck on the fix

 

i guess i'll take it to the stealership... see what they say..... ummmm
i hate going tothem for anything ..